Hoisting-cylinder.



M. P. BERRY. HOISTING CYLINDER. APPLICATION IILIFD FEB. B, 1908.

Patented July 13,1909,

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MILFORD F. BERRY, OF NORTH BANGOR, NEW YORK.

HOISTING-CYLINDER.

Specification of Letters Patent.

Patented July 13, 1909.

Application filed February 8, 1908. Serial N 0. 414,959.

To all whom it may concern:

Be it known that I, MILFORD F. BERRY, a citizen of the United States, residing at North Bangor, in the county of Franklin and State of New York, have invented a new and useful Hoisting-Cylinder, of which the following is a specification.

This invention relates to fluid pressure hoists of that general class shown and described in United States Letters Patent issued to me on the 22 day of May, 1906 under Serial No. 821,399.

The object of the invention is to improve and simplify the construction of the hoisting cylinder and to so arrange the air escape port with respect to the rear end of the cylinder that when the piston reaches the end of its working stroke, said piston will close the air port and thus prevent the escape of steam through the same.

A further object of the invention is to form the interior walls of the cylinder with a plurality of spaced longitudinal grooves which permit the passage of live steam to the rear of the piston thereby to equalize the pressure on opposite sides of the piston proportions and minor details and stop the latter at a predetermined point.

A further object is to provide means for lubricating the cylinder, and means for regulating a quantity of air admitted to the rear end of the cylinder.

A still further object of the invention is generally to improve this class of devices so as to increase their utility, durability and efficiency.

Further objects and advantages will appear in the following description, it being understood that various changes in form,

of construction may be resorted to within the scope of the appended claims.

In the accompanying drawings forming a part of this specification: Figure 1 is a plan view of a hoisting device constructed in accordance with my invention. Fig. 2 is a longitudinal sectional View of the cylinder and its associated parts. Fig. 3 is a similar view taken at right angles to the plane of Fig. 2. Fig. 4. is a transverse sectional view taken on the line 14 of Fig. .2.

Similar numerals of reference indicate corresponding parts in all of the figures of the drawings.

The hoisting device comprises a mast 5 having its lower end journaled in a stepped bearing 6 and its upper end provided with a horizontal arm 7 on which is journaled a roller 8, the latter forming a support for a rope or cable 9 carrying the hoisting device 10. These parts are clearly shown and described in my former patent and form no part of the present invention, the essential feature of which is a hoisting cylinder and the particular arrangement of ports for controlling the movement of the piston.

The cylinder comprises an elongated casing 11 having terminal annular enlargements 12 to which are bolted or otherwise rigidly secured the cylinder heads 13 and 14.

Mounted for reciprocation within the cylinder 11 is a piston 15, the'rod 16 of which is operatively connected with the rope or cable 9 so that when the steam or other fluid is admitted to the interior of the cylinder the piston 15 will be forced longitudinally of the latter to effect the hoisting operation.

Formed in the forward end of the cylinder is a recess 17 which also extends partly within the adjacent annular enlargement 12 and constitutes a combined inlet and exhaust port, there being a pipe section 18 threaded in the walls of the head 14 at the recess 17 and leading to a steam boiler or other suitable source of fluid supply.

Extending vertically from the pipe section 18 is a pipe 19 to the upper end of which is secured an oil cup 20 of any suitable construction, so that as the piston is reciproeated within the cylinder the'oil from the cup 20 may be automatically supplied to said cylinder thereby to lubricate the same.

Secured to the pipe 18 is a depending pipe 21 provided with a valve 22 for regulating the quantity of steam admitted to the cylinder, there being an exhaust pipe 28 extending laterally from the pipe 21 and provided with a similar valve 2 1 for regulating the exhaust.

Spaced from the rear head 13 of the cylinder is an air escape opening or port 25 in the Walls of which is threaded a pipe 26 having a valve 27 for regulating the quantity of air discharged from the rear end of the cylinder as the piston 15 completes its working stroke. The port 25 is so arranged that when the piston approaches the limit of its Working stroke, said piston will cover and form a closure for the port 25v thereby to prevent the escape of steam from the cylinder.

length of the grooves or channels 28 is such that when the piston nears the end of its working stroke said piston will cover both the port 25 and the inner ends of the channels 28 so as to form separate chambers on opposite sides of the piston, a further longitudinal movement of said piston permitting the steam from the forward chamber to pass through the channels 28 to the rear of the piston without allowing said steam to escape through the port 25, the latter being closed by the piston when the inner ends of the channels are exposed to establish co1nmuni cation between the front and rear chambers of the cylinder.

A check valve 29 of any suitable construction is threaded in an opening 30 of the rear cylinder 13, said check valve being so arranged as to open and admit air to the cylinder on the forward stroke of the piston and to automatically close and confine the air at the rear of the piston on the working stroke of the latter. It will thus be seen that when the piston is moved in the direction of the head 13 the air forms a cushion at the rear end of the cylinder, the quantity of air expelled from the cylinder through the port 25 being regulated by adjusting the valve 27. It will also be noted that when the piston reaches the end of its working stroke, or nearly so, said. piston will form a closure for the port 25 so as to prevent the escape of steam through said port, while at the same time allowing the steam from one side of the piston to pass through the grooves 28 to the rear side of the piston so as to equalize the pressure, in the cylinder in the manner before stated.

A hoisting cylinder made in accordance with the present invention is strong and durable in construction and thoroughly efficient in operation and will perform its functions in a satisfactory manner.

From the foregoing description, it is thought that the construction and operation of the device will be readily understood by those skilled in the art and further description thereof is deemed unnecessary.

Having thus described the invention what is claimed is:

1. A cylinder having at one end an inlet and exhaust port for an operating fluid, a piston arranged within the cylinder, a valved passage disposed adjacent the opposite end of the cylinder, and a by-pass formed in the walls of the cylinder for placing the opposite ends of the cylinder in com munication with each other as the piston nears the limit of its working stroke.

2. A cylinder having at one end an inlet and exhaust port for an operating fluid, a piston arranged within the cylinder, and a valved passage disposed in advance of the oppositeend of the cylinder, there being a grooveformed in the interior walls of the cylinder for placing the opposite ends of the cylinder in communication with each other as the piston nears the limit of its working stroke.

3. A cylinder having at one end a com bined inlet and exhaust port for an operating fluid, a piston arranged within the cylinder, and a valved passage disposed in advance of the opposite end of the cylinder, there being a plurality of spaced'longitudinally disposed grooves formed in the interior walls of the cylinder for placing the opposite ends of the cylinder in communication with each other as the piston nears the limit of its working stroke.

1. A cylinder having at one end a combined inlet and exhaust port for an operating fluid, a piston arranged within the cylinder, a valved passage disposed adjacent the opposite end of the cylinder and closed by the piston when the latter nears the end of its working stroke, a check valve at the rear end of the cylinder, and a byass formed in the walls of the cylinder for p acing the opposite ends of the cylinder in communication with each other when. the piston covers the valved passage.

5. A cylinder having at one end a combined inlet and exhaust port, a piston working within the cylinder, a valved passage disposed in advanccof the opposite end of the cylinder and closed by the latter when the piston nears the end of its working stroke, a check valve at the rear end of the cylinder, a lubricator for supplying lubricant through the combined inlet and exhaust port to the interior of the cylinder, and spaced longitudinal grooves formed in the interior walls of the cylinder for placing the opposite ends of the cylinder in communicatlon with each other.

6. A cylinder having at one end a combined inlet and exhaust port, a piston mounted for reciprocation within the cylinder, a valved passage dis osed in advance of the opposite end of the cy inder, a steam pipe communicating with the combined inlet and exhaust port, a pipe extending vertically from the steam pipe, an oil cup mounted on said vertical pipe, an exhaust pipe extending laterally from the steam pipe, a check valve carried by the rear end of the cylinder, and a by-pass formed in the interior Walls of the chamber for placing the opposite ends of the cylinder in communication with each other.

7. A cylinder having oppositely disposed annular enlargements, heads secured to the cylinder and rovided with transverse openings one of W ich is threaded, there being a recess formed in one of the annular enlargements and opening into the cylinder to form a combined inlet and exhaust port, a piston mounted for reciprocation within the cylinder and provided with a rod extending through the opening in one of the heads, a check valve engaging the threaded Walls of the opening in the opposite head, a valved passage disposed in advance of the check valve, a valved steam pipe communicating with the combined inlet and exhaust port, a vertical ipe extending from the steam pipe, an oil cup mounted on the vertical pipe, an exhaust pipe extending laterally from the steam pipe and provided with a valve, there being spaced longitudinally dis osed grooves formed in the interior wa ls of the cylinder for placing the opposite ends of the cylinder in communication with each other as the piston nears the end of its Working stroke.

8. A cylinder having a combined inlet and exhaust port at one end thereof, a piston mounted for reciprocation within the cylinder, a check valve carried by the opposite end of the cylinder, and a valved passage disposed in advance of the check valve, there eing a plurality of spaced longitudinally disposed grooves formed in the interior walls of the cylinder and extending from the rear end of the cylinder to a point in advance of the valved passage for placing the opposite ends of the cylinder in communication with each other as.the piston nears the end of its working stroke.

9. A cylinder having at one end an inlet and exhaust port for an operating fluid, a piston arranged within the cylinder, a discharge port disposed adjacent the opposite end of the cylinder, and a bypass for placing the opposite ends of the cylinder in communication with each other, said by-pass and discharge port being so disposed that the piston forms a closure for both as the piston approaches the limit of its working stroke and exposes the by-pass and closes said port as the piston completes its working stroke.

10. A cylinder having at one end an inlet and exhaust port for an operating fluid, a piston arranged within the cylinder, a discharge ort disposed adjacent the opposite end of t e cylinder, and channels formed in the interior walls of the cylinder for establishing communication between the opposite ends of the cylinder, said channels and ports being so disposed that the piston covers the channels and escape port as the piston approaches the limit of its working stroke and exposes said channels and closes the escape port as the piston completes its working stroke. a

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

MILFORD F. BERRY.

Witnesses:

A. O. BARNI-IART, F. H. JUSTIN. 

